Preparation of magnetic metal-filled carbon nanocapsules
a carbon nanocapsule and metal-filled technology, applied in the direction of magnetism bodies, crystal growth process, polycrystalline material growth, etc., can solve the problems of reducing the purity of products, difficult to separate products, and inability to use magnetic attraction for product separation, etc., to achieve high purity
Inactive Publication Date: 2005-03-29
IND TECH RES INST
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Benefits of technology
The present invention provides a method for producing high purity magnetic metal-filled carbon nanocapsules. The method involves using an arc chamber containing a graphitic anode and a composite graphitic cathode containing at least one kind of magnetic metal or its derivatives. An inert gas is introduced into the arc chamber and a voltage is applied across the cathode and the anode by a pulse current, the voltage sufficient to generate a carbon arc reaction between the cathode and the anode. The deposit formed on the cathode is collected and purification steps are taken to separate the main product from the carbon nanotube byproduct. The magnetic metal-filled carbon nanocapsules are then extracted and cleaned using acidic or basic solution and alcohol. The technical effect of this invention is to provide a reliable method for producing high purity magnetic metal-filled carbon nanocapsules.
Problems solved by technology
However, conventional methods for producing magnetic metal-filled carbon nanocapsules produce mainly single layer carbon nanotubes, but few carbon nanocapsules.
Owing to the strong van der Waals force between carbon nanocapsules and nanotubes, it is not easy to separate the products.
In addition, single layer carbon nanotubes have an end capped with metal particles of catalyst having magnetism as the magnetic metal-filled carbon nanocapsules, therefore magnetic attraction cannot be used for product separation.
Conventional methods are not able to produce high purity magnetic metal-filled carbon nanocapsules, huge amounts of carbon ash impurities and single layer carbon nanotubes exist and lower the purity of products, increasing the cost.
The related application on magnetic metal-filled carbon nanocapsules is limited and insufficient.
Method used
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This example uses the arc chamber shown in FIG. 1 to prepare magnetic metal-filled carbon nanocapsules. One graphite rod was used as a anode, and one composite graphite rod was used as a cathode. Both electrodes had a diameter of 0.24 inches and the anode had a rather short length of about 8-10 cm. The composite graphite electrode was made by mixing the powders of carbon and Co at a molar ratio of 100:5 with melamine resin having a weight percent of 20 of total powders weight. The mixture was then molded into an electrode by a hot-press machine under 170° C. The composite electrode was heated to 700° C. without exposure to oxygen to graphitize the resin.
Argon was introduced into the arc chamber at 60-90 cm3 / min. The pressure of the arc chamber was controlled to 1.2 atm. The arc chamber was surrounded by flowing cooling water.
A carbon arc reaction was performed under the following conditions: a pulse frequency of about 60 Hz, voltage of about 20 V, and electric current of about 100 A...
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Abstract
A method of producing magnetic metal-filled carbon nanocapsules. An arc chamber comprising a graphitic anode and a composite graphitic cathode containing at least one kind of magnetic metal or it's derivatives is provided, before introducing an inert gas into the arc chamber, applying a voltage across the cathode and the anode by a pulse current, the voltage sufficient, to generate a carbon arc reaction between the cathode and the anode, and finally collecting a deposit formed on the cathode.
Description
FIELD OF THE INVENTIONThe present invention relates to a method for producing magnetic metal-filled carbon nanocapsules, and more particularly to a method for producing high purity magnetic metal-filled carbon nanocapsules.BACKGROUND OF THE INVENTIONA magnetic metal-filled carbon nanocapsule is a polyhedral carbon cluster constituting multiple graphite layers having a balls-within-a ball structure with magnetic metals, metal compounds, metal, carbides or alloys therein. The diameter of a magnetic metal-filled carbon nanocapsule is about 3-100 nm. Magnetic metal-filled, carbon nanocapsules have special fullerene structure and optoelectronic properties. The magnetic metal nanoparticles therein is well-protected by the outer graphite layers from oxidation and acidic etching. Magnetic metal-filled carbon nanocapsules can be utilized in various fields such as medicine (medical grade active carbon), light and heat absorption, magnetic recording, magnetic fluids, catalysts, sensors, and na...
Claims
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IPC IPC(8): H01F1/00B82B3/00C01B31/02C30B23/00C30B29/60H01F1/06
CPCB82Y25/00B82Y30/00B82Y40/00C01B31/0233C30B23/00C30B29/605Y10S977/846H01F1/0045Y10S977/844C22C2026/001C01B32/162
Inventor HWANG, GAN-LIN
Owner IND TECH RES INST